
Greenville
- County:
- Mercer County
- County Seat:
- No
- Area (mi²):
- 1.887
- State:
- Pennsylvania
Greenville is a borough located in Mercer County, Pennsylvania. Greenville has a 2025 population of 5,450. Greenville is currently declining at a rate of -0.31% annually and its population has decreased by -1.52% since the most recent census, which recorded a population of 5,534 in 2020.
The average household income in Greenville is $65,994 with a poverty rate of 11.63%. The median age in Greenville is 33 years: 31.2 years for males, and 33.4 years for females.